Let's see the manufacturing process homemade in the video:
Surely many had to hammer a nail into the wall in order to hang some kind of picture, but what if there was a wiring there? So I faced such a problem, how to find the wiring in the wall, so as not to damage it.
Materials and tools:
To assemble the detector we need: three diodes marked 2N3904, a resistor with a resistance of 1 MOhm, a resistor with a resistance of 100 kilo-ohms, a resistor with a resistance of 220 Ohms, any plastic card, LED, switch and 10-15 cm of copper wire.
Then it is necessary to solder these three transistors together and the emitter leg should be soldered to the base leg of the next transistor, or more simply, each right leg is soldered to the middle leg of the other transistor. Then we solder to the collector leg of each transistor with a resistor.
After that, we add an LED to our design, as shown in the picture.
Then, it is necessary to solder the copper wire to the base leg of our first transistor, it will serve as an antenna for us, it should turn out something like this.
Then we take a plastic card and use hot glue to glue our design to the card, also solder the switch, glue the box under the batteries and that's it, our design is ready.
